A type of mobile phone missed call where the caller deliberately cancels a call after it has started ringing but before the recipient can answer. An act designed to encourage the recipient to phone the caller back, thereby making the original recipient pay for the call.

Recipient: Did you just drop call me?
Original caller: Yeah, sorry, I've got hardly any credit.

When you call someone but you hang up after 1 ring. The person you called gets a message saying that they had a missed call and then they're meant to ring you back or if you planned to get a drop call realise what it means. Another word for drop call is one bell and missedcall

Boy 1: I wanna speak to boy 3 but I aint got any credit
Boy 2: Drop call him and im sure he'll call you back.